/*导航条下拉菜单*/
#expnavlist{
    position: absolute;
    top:34px;
    z-index: 9999;
    padding: .3125rem;
    width: 9.375rem;
    background: rgba(90,90,90,.96);
    border-radius: 3px;
    box-shadow: 0 1px 4px rgba(0,0,0,.5);
}
#expnavlist::after{
    left: 2.625rem;
    content: " ";
    position: absolute;
    top: -.3125rem;
    width: .625rem;
    height: .625rem;
    background: rgba(90,90,90,.96);
    background: -webkit-gradient(linear,100% 100%,0 0,from(transparent),color-stop(0.5,transparent),color-stop(0.51,rgba(90,90,90,.96)),to(rgba(90,90,90,.96)));
    background: -webkit-linear-gradient(135deg,transparent 50%,rgba(90,90,90,.96) 51%,rgba(90,90,90,.96));
    background: linear-gradient(-45deg,transparent 50%,rgba(90,90,90,.96) 51%,rgba(90,90,90,.96));
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}
#expnavlist>div>div{
    position: relative;
    display: block;
    padding: 0 10px;
    font-size: 1.125rem;
    line-height: 2.25rem;
    border-radius: 2px;
    color:#fff;
}
#expnavlist>div>div.isactive{
    color: orange;
    background: #7a7a7a;
}
i{
    display: inline-block;
    width: 11px;
    height: 11px;
    position: absolute;
    margin-top: 3.857143px;
    top: 8px;
    background: url(../img/headlines_icon_arrow.png)no-repeat;
    background-size: 11px;
    margin-left: 3px;
}
#answer1.show::after{
    -webkit-animation:show 0.3s;/*匀速 循环*/
    animation-fill-mode: forwards;
    top:65%;
}
@-webkit-keyframes show{
    0%{ transform:rotate(135deg);}
    25%{transform:rotate(90deg);}
    50%{transform:rotate(45deg);}
    75%{transform:rotate(0deg);}
    100%{ transform:rotate(-45deg);}
}
#answer1.hiddenit::after{
    -webkit-animation:hiddenit 0.3s;/*匀速 循环*/
    animation-fill-mode: forwards;
    top:50%;
}
@-webkit-keyframes hiddenit{
    0%{ transform:rotate(-45deg); }
    25%{transform:rotate(0deg);}
    50%{transform:rotate(45deg);}
    75%{transform:rotate(90deg);}
    100%{ transform:rotate(135deg);}
}